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While early reference 5512 Submariners were two line non-COSC; with the introduction
of the 5513 series about 1963, Rolex submitted many 5512s to COSC certification-but not all.
In some cases, the 5512 case back may be stamped 5513. Not to worry. Rolex did that.
Caliber movements early on were 1530, then 1560 and 1570. Except for small differences, the 5512 and 5513 references shared case size, crystals and many other parts.
But generally, the 5513 was always a 2-line non-COSC/ non-date Submariner.
My 5512 was made in 1960, with the desirable pointed crown guards and gilt dial
of that year. The 1959 5512 is credited with initiating the first Submariner crown guards.
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